scholarly journals Control of a magnetorheological tuned vibration absorber for wind turbine application utilising the refined force tracking algorithm

2017 ◽  
Vol 36 (4) ◽  
pp. 339-353 ◽  
Author(s):  
Paweł Martynowicz
Keyword(s):  
Wind Turbine ◽  
High Performance ◽  
Tracking Algorithm ◽  
Magnetorheological Damper ◽  
Laboratory Model ◽  
Vibration Absorber ◽  
Experimental Implementation ◽  
Force Tracking ◽  
Tower Vibration ◽  
Tuned Vibration Absorber

This work covers selected control issues, including refined force tracking algorithm formulation, concerning the wind turbine tower-nacelle laboratory model equipped with a magnetorheological damper based tuned vibration absorber. The objective of the current research is a development and experimental implementation of the control algorithm that couples basic adaptive stiffness solution with stock magnetorheological damper force tracking concept to obtain a quality tower vibration reduction system. The experiments were conducted assuming monoharmonic, horizontal excitation applied to the assembly modelling the nacelle. The frequency range comprised the neighbourhood of the first bending mode of the tower-nacelle system. The results proved the effectiveness of the adopted algorithm referring to other high-performance solutions.

scholarly journals Study of vibration control using laboratory test rig of wind turbine tower-nacelle system with MR damper based tuned vibration absorber

2016 ◽  
Vol 64 (2) ◽  
pp. 347-359 ◽  
Author(s):  
P. Martynowicz
Keyword(s):  
Vibration Control ◽  
Wind Turbine ◽  
Sliding Mode ◽  
Mr Damper ◽  
Open Loop ◽  
Laboratory Model ◽  
Vibration Absorber ◽  
Fatigue Wear ◽  
Wind Turbine Tower ◽  
Tuned Vibration Absorber

Abstract Wind turbine tower dynamic stress is related to the fatigue wear and reliability of the whole wind turbine structure. This paper deals with the problem of tower vibration control using a specially designed and built laboratory model. The considered wind turbine tower-nacelle model consists of a vertically arranged stiff rod (representing the tower), and a system of steel plates (representing nacelle and turbine assemblies) fixed at its top. The horizontally aligned tuned vibration absorber (TVA) with magnetorheological (MR) damper is located also at the top of the rod (in nacelle system). Force excitation sources applied horizontally to the tower itself and to the nacelle were both considered. The MR damper real-time control algorithms, including ground hook control and its modification, sliding mode control, linear and nonlinear (cubic and square root) damping, and adaptive solutions are compared to the open-loop case with various constant MR damper input current values and system without MR TVA (i.e., MR TVA in “locked” state). Comprehensive experimental analyses and their results are presented.

Vibration control of wind turbine tower-nacelle model with magnetorheological tuned vibration absorber

2015 ◽  
Vol 23 (20) ◽  
pp. 3468-3489 ◽  
Author(s):  
Paweł Martynowicz
Keyword(s):  
Vibration Control ◽  
Wind Turbine ◽  
Sliding Mode ◽  
Mr Damper ◽  
Numerical Analyses ◽  
Comsol Multiphysics ◽  
Laboratory Model ◽  
Vibration Absorber ◽  
Wind Turbine Tower ◽  
Tuned Vibration Absorber

Wind turbine tower dynamic load is related to the fatigue and reliability of the structure. This paper deals with the problem of tower vibration control using specially designed and built numerical and laboratory model. The regarded wind turbine tower-nacelle model consists of vertically arranged stiff rod (representing the tower), and a stiff body fixed at its top representing nacelle assembly that is equipped with horizontally aligned tuned vibration absorber (TVA) with magnetorheological (MR) damper. To model tower-nacelle dynamics, Comsol Multiphysics finite element method environment was used. For time and frequency domain numerical analyses (including first and second bending modes of vibration) of system with TVA and MR damper models, MATLAB/Simulink environment was used with Comsol Multiphysics tower-nacelle model embedded. Force excitation sources applied horizontally to the nacelle, and to the tower itself were both considered. The MR damper real-time control algorithms, including ground hook control and its modification, sliding mode control, linear and nonlinear (cubic and square root) damping, and adaptive solutions are compared to the open-loop case with various constant MR damper input current values and system without MRTVA (i.e. MRTVA in ‘locked’ state). Comprehensive numerical analyses results are presented along with Vensys 82 full-scale tower-nacelle model validation. Finally, preliminary results of laboratory tests are included.

Development of Laboratory Model of Wind Turbine's Tower-Nacelle System with Magnetorheological Tuned Vibration Absorber

2013 ◽  
Vol 208 ◽  
pp. 40-51 ◽  
Author(s):  
Paweł Martynowicz
Keyword(s):  
Laboratory Test ◽  
Mr Damper ◽  
Laboratory Model ◽  
Vibration Absorber ◽  
Model Parameters ◽  
Test Rig ◽  
Development Stages ◽  
Modes Of Vibration ◽  
System Uncertainties ◽  
Tuned Vibration Absorber

The paper addresses the consecutive development stages of laboratory model of wind turbines tower-nacelle system with horizontally aligned tuned vibration absorber at its top. To cope with system uncertainties and possibly multiple modes of vibration, tuned vibration absorber is equipped with MR damper instead of passive viscous one. Several laboratory model constraints have to be fulfilled. Discrete frequency-based and Comsol-Simulink analyses were conducted to determine and verify model parameters. Finally, sketch of laboratory test rig design was presented.

scholarly journals Nonlinear Optimal-Based Vibration Control of a Wind Turbine Tower Using Hybrid vs. Magnetorheological Tuned Vibration Absorber

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5145
Author(s):  
Paweł Martynowicz
Keyword(s):  
Vibration Control ◽  
Wind Turbine ◽  
Energy Demand ◽  
Control Method ◽  
Vibration Absorber ◽  
Real Time Control ◽  
Time Control ◽  
Working Space ◽  
Wind Turbine Tower ◽  
Tuned Vibration Absorber

This paper presents an implementation of a nonlinear optimal-based wind turbine tower vibration control method. An NREL 5.0 MW tower-nacelle model equipped with a hybrid tuned vibration absorber (HTVA) is analysed against the model equipped with a magnetorheological TVA (MRTVA). For control purposes, a 3 kN active actuator in parallel with a passive TVA is used in the HTVA system, while an MR damper is built in the MRTVA instead of a viscous damper, as in a standard TVA. All actuator force constraints are embedded in the implemented nonlinear control techniques. By employing the Pontryagin maximum principle, the nonlinear optimal HTVA control proposition was derived along with its simplified revisions to avoid a high computational load during real-time control. The advantage of HTVA over MRTVA in vibration attenuation is evident within the first tower bending frequency neighbourhood, with HTVA also requiring less working space. Using the appropriate optimisation fields enabled an 8-fold reduction of HTVA energy demand along with a (further) 29% reduction of its working space while maintaining a significant advantage of HTVA over the passive TVA. The obtained results are encouraging for the assumed mass ratio and actuator force limitations, proving the effectiveness and validity of the proposed approaches.

scholarly journals Development of an MRE adaptive tuned vibration absorber with self-sensing capability

2015 ◽  
Vol 24 (9) ◽  
pp. 095012 ◽  
Author(s):  
Shuaishuai Sun ◽  
Jian Yang ◽  
Weihua Li ◽  
Huaxia Deng ◽  
Haiping Du ◽  
...  
Keyword(s):  
Vibration Absorber ◽  
Tuned Vibration Absorber

Vibration control using a beam-like adaptive tuned vibration absorber with an actuator-incorporated mass element

2009 ◽  
Vol 223 (7) ◽  
pp. 1555-1567 ◽  
Author(s):  
P Bonello ◽  
K H Groves
Keyword(s):  
Vibration Control ◽  
Effective Mass ◽  
Tuning Range ◽  
Excitation Frequency ◽  
Vibration Absorber ◽  
Time Varying ◽  
Additional Advantage ◽  
Expected Performance ◽  
Vibration Attenuation ◽  
Tuned Vibration Absorber

An adaptive tuned vibration absorber (ATVA) can retune itself in response to a time-varying excitation frequency, enabling effective vibration attenuation over a range of frequencies. For a wide tuning range the ATVA is best realized through the use of a beam-like structure whose mechanical properties can be adapted through servo-actuation. This is readily achieved either by repositioning the beam supports (‘moveable-supports ATVA’) or by repositioning attached masses (‘moveable-masses ATVA’), with the former design being more commonly used, despite its relative constructional complexity. No research to date has addressed the fact that the effective mass of such devices varies as they are retuned, thereby causing a variation in their attenuation capacity. This article derives both the tuned frequency and effective mass characteristics of such ATVAs through a unified non-dimensional modal-based analysis that enables the designer to quantify the expected performance for any given application. The analysis reveals that the moveable-masses concept offers significantly superior vibration attenuation. Motivated by this analysis, a novel ATVA with actuator-incorporated moveable masses is proposed, which has the additional advantage of constructional simplicity. Experimental results from a demonstrator correlate reasonably well with the theory, and vibration control tests with logic-based feedback control demonstrate the efficacy of the device.

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